Lamp



FIG. 1 is a perspective view of a lamp showing my new design;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a top plan view thereof;

FIGS. 4 and 5 are, respectively, left and right side views thereof; and

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a lamp, substantially as shown and described. 